Fluid-pressure valve.



' 1. &A. GRAHAM.

FLUID PRESSURE VALVE.

APPLICATION FILED 05c. 15. I913.

1,217,747. V Patented Feb 27,1917.

I Hal JOHN GRAHAM AND ARCHIBALI) GRAHAM, 0F GLASGOW, SCOTLAND.

FLUID-PRESSURE VALVE.

Specification of Letters Patent.

Patented Feb. 27, 1917.

Application filed December 15, 1913. Serial No. 806,872.

side of the valve, and the object of the in-- vention is to prevent thepassage of steam or pressure fluid except by the two orifices controlled by the duplex faced valve.

In order that others skilled in the art may understand our invention we have hereunto appended one sheet of illustrative drawings in which Figure 1 is a sectional elevation of part of a reducing valve constructed in accordance with our invention and Fig- 2 is an inverted plan of half of the valve corresponding to Fig. 1.

Referring to these drawings In carrying our invention into elfect or practice as applied to pressure reducing or like valves having two valve faces and two valve seats, the valve seating a formed with the seats 6, 0 is formed with a bored center piece or sleeve (Z which acts as a guide for the valve and provides a housing for the rod or valve stem 71,. The valve shaving the faces 7", g is also formed with a pendent center piece or sleeve h which fits within the guide (Z.

preventing the leakage of pressure fluidbetween the central sleeve 72, of the valve and the guide (Z, a flexible packing in the form of a thin flat ring i of suitable metal such as sheet bronze is secured to a flange j on the lower end of the guide cl. In order to secure a fluid tight joint with the sleeve it this has a rounded bead or rim 70 formed on its lower end, and the ring 2' constantly rests upon the rim 70 being pressed against it by the greater pressure belowthe valve.

This arrangement of value is specially suitable for controlling fluid under pressure and has only a limited opening being formed with two faces and therefore capable of discharglng fluid pressure at two orifices instead of one.

As the lift of the valve is very limited the end of the valve guide will always be in contact with the center part of flexible packing either when valve is open or shut.

What we claim and desire to secure by Letters Patent is 1. The combination of a structure having'a valve seat and a tubular guide; a valve formed to cooperate with said seat and having an extension terminatingin an annular face; with a flexible annular packing member Loosely engaging said annular face and held against the same by pressure in said structure.

2. The combination of a structure having a valve seat and a tubular guide; a valve formed to cooperate with said seat and having a sleevemovable in said guide; a relatively thin flat ring fixed to one of the two parts comprised by the sleeve and the tubular guide and loosely held against the other of said parts by the pressure in said structure.

3. The combination of a structure having a valve seat and a flanged tubular guide; a valve formed to cooperate with said seat and having a sleeve longitudinally movable in said guide, the end of said sleeve adja cent the flange of the guide having an annular bead thereon; with a relatively thin flexible ring fixed to said flange and loosely engaging said bead under the action of fluid under pressure in the structure. 1

4. The combination of a valve casing; a

r v seat structure mounted therein and having In order to overcome the difficulty heretofore experienced with this type of valve of a flanged tubular guide mounted concentrically within it; a valve formed to cooperate with the seat-of said structure and having a central extension slidable in the guide; with a relatively thin flexible ring fixed to the flange of said guide and loosely engaging the end of the extension of the valve.

In testimony whereof, we have signed our names to this specification, in the presence of two subscribing witnesses.

JOHN GRAHAM.- ARornBA-Lo GRAHAM.

Witnesses:

R. C. THoMsoN, M. MCKENZIE.

Copies of this patent may be obtained for five cents each,-by addressing the Commissioner of Patents, Washington, D. G. 

